白木耳俗称银耳,以白色、耳藏大、质软、糯性大、发头好者为佳。银耳抗热弱,不易久藏,久藏则易发黄。一般医药业和耳农常用硫磺薰制漂白,以保持银耳色泽美观。但是,放置稍久,银耳的颜色发黄加深,继而泛红。用硫磺薰制过的银耳会变酸,发性也差,不易煮糯。另外,薰制多采用工业用硫磺,固含有毒的砷成分,用它来作薰剂会污染银耳。故认为,银耳不宜用硫磺薰制。 White fungus commonly known as white fungus, with white, large ears, possession of soft, large, good hair is better. Tremella fungus is resistant to heat, it is not easy to hide for a long time, but it is easy to yellow when it is stored for a long time. The general medical industry and ear farmers commonly use sulfur to purify and bleach, in order to maintain the appearance of white fungus. However, for a longer period of time, the color of the white fungus became yellow and then reddened. Smoked white fungus made of sulphur will become sour and have poor performance. It is not easy to cook oysters. In addition, the use of sulfur for industrial use of sulfur, solid containing toxic arsenic components, use it as a fumigant contaminated Tremella. Therefore, it is believed that white fungus should not be smoked with sulfur.